For private transactions Monero, for smart contracts and decentralized finance Ethereum :)
Discussion
I was referring to communication and social media. None of those is very interesting to be, monero is too small (yet), eth has broken incentives (personal opinion, don’t feel the need to disprove me)
Yes, I know... I said the obvious, I don't see it so clearly within communication or social media. I like a lot of protocols, but I have no universal answers here